Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Poster: Charge Effects in Soft and Biological Matter

CPP 33.3: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster C

Application of Transient Current Measurements at High Voltages to salt containing poly(ethylene oxide) — •Jens Balko, Peter Kohn, Klaus Schröter, and Thomas Thurn-Albrecht — Institute of Physics, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany

Poly(ethylene oxide) (PEO) based solid polymer electrolytes attract great interest due to their potential use in battery technology. Though conductivity measurements of salt-polymer complexes are frequently reported the independent determination of the charge carrier density and the mobility of ions is difficult. We studied these two quantities by a recently proposed method using transient current experiments at high voltages. The applicability of this method relies on the complete depletion of ions in the bulk as well as the use of blocking electrodes, i.e. the absence of electrochemical reactions at the metal-polymer interface. At low ion content we find consistent values for the charge carrier density, mobility and conductivity. However at higher lithium salt concentrations electrochemical reactions take place that limit the application of the method. We discuss the influence of salt concentration, electrode material and applied voltage.